This is a video featuring the Bulgarian military marching and other army-related activities during WW2. The song is from the game Command & Conquer and it's called "Hell March".
More tags, ignore this:
Bulgarian Hell March WW2
Bulgarien Hell Marsch WW2
World War 2 Bulgaria Bulgarian Hell March Marching Military Soldiers Army |Y| iYi
Българска Армия Марш Марширува Втора Световна Война ВСВ